Heat exchanger



Sept. 21, 1965 A. WHITTELL, JR

HEAT EXCHANGER Filed June 2, 1961 Illlllllllllllllllllllll United States Patent 3,207,215 HEAT EXCHANGER Alfred Whittell, Jr., Los Angeles, Calif. Raypak Co. Inc., 2416 Chico Ave., El Monte, Calif.) Filed June 2, 1961, Ser. No. 114,399 1 Claim. (Cl. 165134) This invention relates to an improved heat exchanger.

It is an object of this invention to provide a heat exchanger, such as a hot water boiler, wherein all water way-s are coppered to avoid corrosion.

It is still a further object of this invention to shield the parts of the exchanger which are not copper from the water circulated therein.

It is still a further object of this invention to provide a heat exchanger of high efliciency and volume.

Other objects and advantages will be readily apparent from the following description:

In the drawings:

FIGURE 1 is a fragmentary perspective of the front header with parts broken away.

FIGURE 2 is a side elevation with the headers in section.

FIGURE 3 is a diagrammatic view of the tubing supporting and sealing assembly.

FIGURE 4 is a view similar to FIGURE 3 with the liner and tube sheet assembled.

FIGURE 5 is a view similar to FIGURE 4 with the tube assembled.

FIGURE 6 is a perspective of the tube sheet with a portion thereof broken away.

A heat exchanger is provided with a front header 10 and a rear header 12 with copper tubing 14 therebetween. A series of fins 16 are provided on each tube 14 to facilitate heat transfer.

The tubes are arranged in four banks so that water entering the front head through inlet 18 is directed by bafile 20 into the first group or bank of tubes to the rear header. The rear header is divided into upper and lower chambers 22 and 24 by baffle 26 and water enters the lower chamber 22 on the right hand side and its direction is reversed flowing through a second bank of tubes back to the front header. The flow is then between baffles 20 and 28 to a third bank of tubes leading to upper chamber 24 where flow is directed through a fourth bank of tubes to the front header 10 and hence outlet 30.

Thus the water makes four passes through the heated 3,207,215 Patented Sept. 21, 1965 gases from a burner (not shown) positioned beneath the tubes. The first two passes are closest to the burner to facilitate the heat transfer.

The tubes 14 are of copper and the headers and their bafiies of bronze. However, a tube sheet 32 is provided as a tube support at either end of the exchanger and is fixed to the housing 34 thereof.

To add strength and reduce expense, these tube sheets are of cast iron which have the outerface thereof very finely ground. A heavy duty deep drawn copper liner 36 is then utilized having a series of tubular protuberances 38 formed therein which may be inserted into holes 40 in the tube sheet as best seen in FIGURE 4. The tubes 14 are then inserted through the liner and flared back as at 42, best seen in FIGURE 5.

The headers 10 and 12 are secured by screws or otherwise to the tube sheets 32 to complete the assembly.

Thus, the water ways in the heat exchanger are all copper or bronze with the ferrous tube sheet shielded therefrom.

While what hereinbefore has been described as the preferred embodiment of this invention, it is readily apparent that alterations and modifications can be resorted to without departing from the scope of this invention and such alterations and modifications are intended to be included within the scope of the appended claim.

I claim:

A heat exchanger assembly comprising: a ferrous tube sheet having holes therethrough, a copper sheet liner lying against one face of said tube sheet and having tubular protuberances thereon extending substantially through said holes from said one face, a series of copper tubes projecting through said holes and protuberances from the other face of said tube sheet, and having the extremities thereof flared outwardly into contact with the outer face of said liner.

References Cited by the Examiner UNITED STATES PATENTS 948,373 2/10 Elliott 172 X 1,420,182 -6/ 22 Cleveland 122365 X 1,589,646 6/ 26 Hicks.

2,447,259 8 48 Lucke.

CHARLES SUKALO, Primary Examiner.

L. MARTIN, Examiner. 

